export type { ApplicationCss };
declare class ApplicationCss {
    private styles;
    /**
     * Add a style to the StyleContext of this React-Gnome application.
     *
     * Styles must be added before the `render()` function is called to
     * take effect.
     */
    addStyles(style: string | {
        resource: string;
    } | {
        file: string;
    }): void;
}